SpringBoot Add docker compose support for apache/activemq-classic

We currently support symptoma/activemq, but test containers uses apache/activemq-classic so I wonder if we should unify.

Comment From: eddumelendez

Hi @philwebb, at the beginning symptoma/activemq was supported because official images were not provided by Apache ActiveMQ team. I see Docker Compose support for ActiveMQ Classic here. I'm not sure if I am missing something.

Comment From: wilkinsona

Thanks, @eddumelendez. I don't think you're missing anything. The support looks complete to me and it is documented.

Comment From: philwebb

Sorry, I added this one in a bit of a rush yesterday. I was expecting a single ConnectionDetailsFactory implementation with two supported names but it looks like the environment keys are different so that's probably why we have two distinct implementations.